/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.tsfile.fileSystem.fsFactory;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URI;

public class HDFSFactory implements FSFactory {

    private static final Logger logger = LoggerFactory.getLogger(HDFSFactory.class);
    private static Constructor constructorWithPathname;
    private static Constructor constructorWithParentStringAndChild;
    private static Constructor constructorWithParentFileAndChild;
    private static Constructor constructorWithUri;
    private static Method getBufferedReader;
    private static Method getBufferedWriter;
    private static Method getBufferedInputStream;
    private static Method getBufferedOutputStream;
    private static Method listFilesBySuffix;
    private static Method listFilesByPrefix;
    private static Method renameTo;

    static {
        try {
            Class<?> clazz = Class.forName("org.apache.iotdb.hadoop.fileSystem.HDFSFile");
            constructorWithPathname = clazz.getConstructor(String.class);
            constructorWithParentStringAndChild = clazz.getConstructor(String.class, String.class);
            constructorWithParentFileAndChild = clazz.getConstructor(File.class, String.class);
            constructorWithUri = clazz.getConstructor(URI.class);
            getBufferedReader = clazz.getMethod("getBufferedReader", String.class);
            getBufferedWriter = clazz.getMethod("getBufferedWriter", String.class, boolean.class);
            getBufferedInputStream = clazz.getMethod("getBufferedInputStream", String.class);
            getBufferedOutputStream = clazz.getMethod("getBufferedOutputStream", String.class);
            listFilesBySuffix = clazz.getMethod("listFilesBySuffix", String.class, String.class);
            listFilesByPrefix = clazz.getMethod("listFilesByPrefix", String.class, String.class);
            renameTo = clazz.getMethod("renameTo", File.class);
        } catch (ClassNotFoundException | NoSuchMethodException e) {
            logger.error(
                    "Failed to get Hadoop file system. Please check your dependency of Hadoop module.", e);
        }
    }

    @Override
    public File getFileWithParent(String pathname) {
        try {
            File res = (File) constructorWithPathname.newInstance(pathname);
            if (!res.exists()) {
                res.getParentFile().mkdirs();
            }
            return res;
        } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
            logger.error(
                    "Failed to get file: {}. Please check your dependency of Hadoop module.", pathname, e);
            return null;
        }
    }

    @Override
    public File getFile(String pathname) {
        try {
            return (File) constructorWithPathname.newInstance(pathname);
        } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
            logger.error(
                    "Failed to get file: {}. Please check your dependency of Hadoop module.", pathname, e);
            return null;
        }
    }

    @Override
    public File getFile(String parent, String child) {
        try {
            return (File) constructorWithParentStringAndChild.newInstance(parent, child);
        } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
            logger.error(
                    "Failed to get file: {}. Please check your dependency of Hadoop module.",
                    parent + File.separator + child,
                    e);
            return null;
        }
    }

    @Override
    public File getFile(File parent, String child) {
        try {
            return (File) constructorWithParentFileAndChild.newInstance(parent, child);
        } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
            logger.error(
                    "Failed to get file: {}. Please check your dependency of Hadoop module.",
                    parent.getAbsolutePath() + File.separator + child,
                    e);
            return null;
        }
    }

    @Override
    public File getFile(URI uri) {
        try {
            return (File) constructorWithUri.newInstance(uri);
        } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
            logger.error(
                    "Failed to get file: {}. Please check your dependency of Hadoop module.", uri, e);
            return null;
        }
    }

    @Override
    public BufferedReader getBufferedReader(String filePath) {
        try {
            return (BufferedReader)
                    getBufferedReader.invoke(constructorWithPathname.newInstance(filePath), filePath);
        } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
            logger.error(
                    "Failed to get buffered reader for {}. Please check your dependency of Hadoop module.",
                    filePath,
                    e);
            return null;
        }
    }

    @Override
    public BufferedWriter getBufferedWriter(String filePath, boolean append) {
        try {
            return (BufferedWriter)
                    getBufferedWriter.invoke(constructorWithPathname.newInstance(filePath), filePath, append);
        } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
            logger.error(
                    "Failed to get buffered writer for {}. Please check your dependency of Hadoop module.",
                    filePath,
                    e);
            return null;
        }
    }

    @Override
    public BufferedInputStream getBufferedInputStream(String filePath) {
        try {
            return (BufferedInputStream)
                    getBufferedInputStream.invoke(constructorWithPathname.newInstance(filePath), filePath);
        } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
            logger.error(
                    "Failed to get buffered input stream for {}. Please check your dependency of Hadoop module.",
                    filePath,
                    e);
            return null;
        }
    }

    @Override
    public BufferedOutputStream getBufferedOutputStream(String filePath) {
        try {
            return (BufferedOutputStream)
                    getBufferedOutputStream.invoke(constructorWithPathname.newInstance(filePath), filePath);
        } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
            logger.error(
                    "Failed to get buffered output stream for {}. Please check your dependency of Hadoop module.",
                    filePath,
                    e);
            return null;
        }
    }

    @Override
    public void moveFile(File srcFile, File destFile) {
        try {
            renameTo.invoke(constructorWithPathname.newInstance(srcFile.getAbsolutePath()), destFile);
        } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
            logger.error(
                    "Failed to rename file from {} to {}. Please check your dependency of Hadoop module.",
                    srcFile.getName(),
                    destFile.getName());
        }
    }

    @Override
    public File[] listFilesBySuffix(String fileFolder, String suffix) {
        try {
            return (File[])
                    listFilesBySuffix.invoke(
                            constructorWithPathname.newInstance(fileFolder), fileFolder, suffix);
        } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
            logger.error(
                    "Failed to list files in {} with SUFFIX {}. Please check your dependency of Hadoop module.",
                    fileFolder,
                    suffix,
                    e);
            return null;
        }
    }

    @Override
    public File[] listFilesByPrefix(String fileFolder, String prefix) {
        try {
            return (File[])
                    listFilesByPrefix.invoke(
                            constructorWithPathname.newInstance(fileFolder), fileFolder, prefix);
        } catch (InstantiationException | InvocationTargetException | IllegalAccessException e) {
            logger.error(
                    "Failed to list files in {} with PREFIX {}. Please check your dependency of Hadoop module.",
                    fileFolder,
                    prefix,
                    e);
            return null;
        }
    }

    @Override
    public boolean deleteIfExists(File file) {
        return file.delete();
    }
}
